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Grade S420 0.5 in. x 120 in. x 480 in. steel plate front view.
Grade S420 0.5 in. x 120 in. x 480 in. steel plate right view.
Grade S420 0.5 in. x 120 in. x 480 in. steel plate top view.

EN Standard S420 Structural Steel Plate

S420 structural steel plate is a high-strength EN structural steel used in applications such as power plants, mining or earth-moving equipment and load-handling equipment.

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Features

  • Available in normalized or thermomechanical (TMCP) conditions.

  • Meets European EN 10025 structural steel requirements.

  • Due to quickly shifting inventory, please inquire about available sizes.

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Product Details

Grade Thickness Width Length
S420NL 16-100mm (3/16-4") 1220-3050mm (48-120") Up to 12m (480")
Thickness Range Yield (MPa) Tensile (MPa) Yield (ksi)
≤16 mm (0.6") 420 520-680 61
>16 to ≤40 mm (0.6"-1.6") 400 520-680 58
>40 to ≤63 mm (1.6"-2.5") 390 520-680 57
>63 to ≤80 mm (2.5"-3.1") 370 520-680 54
>80 to ≤100 mm (3.1"-3.9") 360 520-680 52

Grade Comparison

Frequently Asked Questions

Learn more about EN Standard S420 steel plate.
S355 and S420 are both EN structural steel grades, but S420 has a higher minimum yield strength. S355 is often used when a project needs higher strength than S235 or S275, while S420 may be selected for more demanding structural applications that require greater load-bearing performance, such as heavy equipment, power plant or mining-related components.
S420 steel plate is used in structural applications that require higher strength than lower-yield EN structural grades. Common uses include power plants, mining and earth-moving equipment, load-handling equipment, heavy machinery and other structural components that need strong load-bearing performance.
In S420 steel plate, the “S” stands for structural steel, and “420” refers to the minimum yield strength of 420 MPa for certain thickness ranges. This EN naming system identifies the steel’s structural use and base strength level.
S420N, S420NL, S420M and S420ML are S420 qualities with different delivery conditions and toughness requirements. S420N and S420NL are normalized or normalized rolled qualities, while S420M and S420ML are thermomechanically rolled, or TMCP, qualities. The “L” designation indicates enhanced low-temperature toughness, commonly tied to impact requirements at lower service temperatures.
Normalized S420 plate is heat-treated to refine the steel structure and support consistent toughness. Thermomechanically rolled S420, or TMCP S420, is processed through controlled rolling and cooling to achieve high strength, toughness and weldability. The right condition depends on the project specification, required toughness, fabrication needs and service environment.